Metal joist



J. D. COBER May 24, 1927.

METAL JOIST Filed May 6, 1926 Inventor J J C'oer;

a 1 Mam.

Attorney PATENT OFFICE.

JAY DEVON COBEB, OF HUNTINGTON, WEST VIRGINIA.

METAL JOIST.

Application filed Kay 6,

'Ilhis invention relates to an improved metal joist or girder for use in building construction work, and the same has more particular reference'to a simple and inexpensive light weight metal structure of this kind which will serve as an effective substitute forthe Wooden joists ordinarily used.

Briefly, the invention has more particular reference to a fabricated joist which includes upper and lower chords connected together by vertical struts and diagonal braces.

One feature of construction is the upper chord which is made up of a pair of substantially duplicate angle irons disposed in side by side relation with the vertical upstanding flanges in spaced parallelism, the upper edges of the flanges being directed outwardly into diverging relation and deformed for retaining slabs in position.

Another feature of construction is the lower chord which is also composed of a pair of angle irons arranged in side by side relation, the feature here being in the relative heights of the vertical flanges wherein the longitudinal edge of the higher one is bent over the upper edge of the lowerone to permit convenient connection of a part of a. brid 'ng unit.

Other eatures and advantages of the invention will become apparent from the following description and drawing.

In the accompanying drawing forming part of this application and in which like numerals are employed to designate like parts throughout the same 2-- Figure 1 is a side elevation of a joist constructed in accordance with the present invention. i I

Figure 2 is an enlarged vertical section taken approximately upon the line 22 of Figure 1.

Figure 3 is a horizontal section through one of the struts, the section being taken on p the line 3-3 of Figure 1.

Figure 4 is a vertical section taken on the line 44 of Fi re 1. I r

, Referring to t e drawing in detail, it will be seen that the improved device comprises an upper chord 1 and a lower chord 2 with diagonal braces reinforcing and connecting The means preferably comprises a plurality of longitudinally spaced struts 3 having upstanding flanges or wings 4, together with a plurality of The upper chord comprises a pair of anappropriate means therebetween.

1926. Serial No. 107,135.

the horizontal flanges 6 being disposed in the ,same horizontal plane the vertical u standing flanges 7 being disposed in space arallelism. The upper edges 8 of these anges are bent outwardly and away from each other in the divergent relation as shown. It will be noted, at this time, that the upper end portions of the struts 3 extend between the flanges 7 and terminate in a plane with the edges of the bent portions 8. The struts are bolted,'welded or otherwise securely fastened to the angle irons. Moreover the outwardly bent ends 8 are formed with oppozite deformations 9 for retaining slabs in position. This upper chord. together with the upper ends of the struts and truss wires are embedded in the concrete floor or other structure 11 which the invention is adapted to support.

Referring now to the .lower chord 2, 1

- the flange 14 is of a greater height. Moreover the extended upper. end portion of the flange 14 is bent over the upper edge of the flange 13." The purpose of this construction is to provide a convenient means for connecting the parts 16 of a bridging unit with the lower chords. At this time I would direct attention to Figure 2 wherein it will be seen that this part 16 has its bottom flan formed with an extension 17 which un erlies the flange 12 of the adjacent angle iron. Then a portion 18 of this extension is bent up betweenthe flanges 13 and 14 and the extremity of this up-bent portion is formulatedinto a supporting hook 19 which takes over the upper edge of the flange 13. It is obvious that this bent hook 19 isformed when the body 18 is driven 'upwardly between the flanges 13 and 1t and rected upwardly toward the upper one and is fastened thereto. The end portions of the flanges 7 and 13 and 14, respectively, are not bent but are'left in true parallelism. Thus, it will be seen that the bent portions 8 of the flanges 7 of the upper chord merge into straight portions as indicated in Figure 4.

It is believed that by reading the description in connection with the drawing, a clear understanding of the invention will be obtained and a more lengthy description is therefore deemed unnecessary.

While the preferred embodiment has been shown and described, it is to be understood that minor changes coming within the field of invention claimed may be resorted to if desired.

Having described my invention, What I claim and desire to secure by Letters-Patent 18:-

1. In a structure of the class described, upper and lower chords and connecting means therebetween, the upper chord comprising a pair of angle irons arranged in side by side relation with the vertical flanges disposed in spaced parallelism and the upper ends of the flanges directed outwardly into diverging relation. 1

2. n a structure of the class described,

upper and lower chords and connecting means therebetween, the lower chord being constructed from a pair of a-ngle irons arranged in side by side relation, the vertical flanges of the irons being of relatively different heights. i

3. A structure of the class described comprising upper and lower chords, the upper chord comprising a pair of angle irons arranged in side by side relation with the vertical flanges disposed in spaced parallelism and the upper edges of the flanges-directed outwardly into diverging relation, the lower chord being constructed from a pair of angle irons arranged in side by siderela tion and the vertical flanges of these irons being relatively different in height, and connecting means between said chords for disposing the latter in vertically spaced relation, said connecting means comprising a plurality of struts, and diagonal braces as? sociated therewlth.

In testimony whereof I aflix my signature.

JAY DEVON COBER. 

